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  <title>Description of modifyPDF</title>
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  <meta name="description" content="Check PDF and normalize it">
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<div><a href="../../../index.html">Home</a> &gt;  <a href="../../index.html">CO4OI</a> &gt; <a href="../index.html">misc</a> &gt; <a href="index.html">vds_sampling</a> &gt; modifyPDF.m</div>

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<h1>modifyPDF
</h1>

<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="box"><strong>Check PDF and normalize it</strong></div>

<h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="box"><strong>function [new_pdf, alpha] = modifyPDF(pdf, nb_meas) </strong></div>

<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="fragment"><pre class="comment"> Check PDF and normalize it</pre></div>

<!-- crossreference -->
<h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
This function calls:
<ul style="list-style-image:url(../../../matlabicon.gif)">
</ul>
This function is called by:
<ul style="list-style-image:url(../../../matlabicon.gif)">
<li><a href="vdsmask_full.html" class="code" title="function [mask]=vdsmask_full(N,M,p)">vdsmask_full</a>	Inputs</li></ul>
<!-- crossreference -->



<h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="fragment"><pre>0001 <a name="_sub0" href="#_subfunctions" class="code">function [new_pdf, alpha] = modifyPDF(pdf, nb_meas)</a>
0002 
0003 <span class="comment">% Check PDF and normalize it</span>
0004 <span class="keyword">if</span> sum(pdf(:)&lt;0)&gt;0
0005     error(<span class="string">'PDF contains negative values'</span>);
0006 <span class="keyword">end</span>
0007 pdf = pdf/max(pdf(:));
0008 
0009 <span class="comment">% Find alpha</span>
0010 alpha_min = -1; alpha_max = 1;
0011 <span class="keyword">while</span> 1
0012     alpha = (alpha_min + alpha_max)/2;
0013     new_pdf = pdf + alpha;
0014     new_pdf(new_pdf&gt;1) = 1; new_pdf(new_pdf&lt;0) = 0;
0015     M = round(sum(new_pdf(:)));
0016     <span class="keyword">if</span> M &gt; nb_meas
0017         alpha_max = alpha;
0018     <span class="keyword">elseif</span> M &lt; nb_meas
0019         alpha_min = alpha;
0020     <span class="keyword">else</span>
0021         <span class="keyword">break</span>;
0022     <span class="keyword">end</span>
0023 <span class="keyword">end</span>
0024 
0025 <span class="keyword">end</span></pre></div>
<hr><address>Generated on Thu 18-Jul-2013 19:25:15 by <strong><a href="http://www.artefact.tk/software/matlab/m2html/" title="Matlab Documentation in HTML">m2html</a></strong> &copy; 2005</address>
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